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88d89526a6
The SPI driver writes to the bus mode register and performs a sanity check by reading back what we wrote, however only the lower four bits of that register are defined. In some cases, the device side seems to set the higher bits, causing us to fail the sanity check unnecessarily. Check only the lower four bits instead. Thanks to John Goyette from Schick Technologies for pointing out the problem. Signed-off-by: Andrey Yurovsky <andrey@cozybit.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>